# def add(x,y):
#     result = x + y
#     return result
#
# add(2,3)

# def add(x,y):
#     result = x + y
#     return result
#
# r = add(2,3)
# print(r)

# def say_hi():
#     print('Hello World ')
# result = say_hi()
# # print(result)
# # print(f'无返回值，返回的内容是{result}')
# # print(f'无返回值，返回的内容类型是{type(result)}')
# def check_age(age):
#     if age > 18:
#         return 'SUCCESS'
#     else:
#         return None
# result = check_age(16)
# if not result:
#     print('未成年不可以进入')

















